Improvement in bolt-cutters



UNITED STATEs PATENT CFFIcE.

JAMES E. BEOVN, OF CAMBEIDGEPORT, MASSACHUSETTS.

IMPRCVEMENT IN BOLT-CUTTES.

Specification forming part of Letters Patent No. 116,547, dated July 4, 187] antedated June 24, 1871.

T0 all whom it may concern:

Beit known that I, J AMES E. BROWN, of Cambridgeport, ofthe county of Middlesex and State of lllassachusetts, have made a new and useful Invention having reference to what are termed Bolt-Cutters; and do hereby declare the saine to be fully described in the followin g specification and represented in the accompanying drawing, of which- Figure 1 denotes a side elevation, and Figs. 2 and longitudinal sections of my improved boltcutter. Fig. 4 is a top view, Fig. 5 a longitudinal section, and Fig. 6 a transverse section of the cutter-head thereof. Fig. 7 is a top view of the chisel. Fig. 8 is a top view of the adjusting'- 4screw of such chisel.

My present bolt-cutter, in main features or principles, is similar to the bolt-cutter described and represented in Letters Ia-tent No. 107,438, dated September 20, 1870, and granted to me, the improvement or improvcn'ients herein set forth and claimed having reference more particularly to the construction of and mode of combining various of the parts, whereby its malinfacture is rendered cheaper, and the implement is made more durable and easier of operation and use.

In the drawing, A denotes the cutter-head or yoke, provided with the stationary cutter a and a movable or sliding chisel, b, the latter being socketed into a carrier, B, so as to be capable of being slid freely longitudinallytherein. This cutterhead I construct with a cylindrical bore, c, to receive the shank of the chisel, and I make such shank cylindrical to it to and slide in such bore. Furthermore, instead of constructing' the bottom surface ofthe cutter-hea d in one plane, I arrange the bearing part d at an obtuse angle, or on a bevel with the part e or the arms D D, in manner as represented. I also make the chisel, on its bottom and near its point or cutting-edge, with a bevel to correspond with that of the part d., such being as shown in Fig. 3, the front ofthe chisel being formed by two bevels. This beveling of the bottom of both the cutter and the cutter-head renders the bolt-cutter more convenient in use and better applicable to a bolt, and the hands of the operator less liable to being bruised or injured than is the case with the bolt-cutter when made as shown in my said patent. The yoke or cutter-head is formed or provided with two ears, f f, extended from it in manner as shown, the pivotal side plates g g being secured to the head by bolts going through it and them.

The carrier B, furnished with racks or ranges of teeth on its two opposite sides, as shown at h l1, is disposed and 1s to work between a-nd be guided `by the said plates g g, the operative levers D D having sectional gears or ranges of teeth 'i t' to engage with the racks. The screw C, for effectin g the adjustment ofthe chisel relatively to the carrier B and cutter a., screws lengthwise into the carrier, and a-t its inner end is furnished with a round knob or head, 7s, and a neck, I, these latter being introduced into a cavity or recess, mi, formed in the chisel in manner as represented, and opening laterally out of one side thereof so as to enable the chisel to be readily either interlocked with or disconnected from the screw as occasion may require. The screw, while in connection with the chisel, is free to revolve therein. y turning the screw one way the chisel will be advanced, and by revolving the screw the opposite way the chisel will be retracted as respects the carrier. In my former or patented bolt-cutter, as mentioned, the cutter-head was open on its opposite sides, the opening being covered to thc necessary extent by cap-plates bolted to the head. It having been found in practice that such cap-plates were liable to be bent or strained away from the cutter-head so as to cause the chisel to spring laterally and not maintain its due relations with the stationary cutter, I have adopted the plan of making the cutter-head in one entire piece of metal, with a cylindrical bore extending entirely around the chisel, which I also make cylindrical in that part of it which is to enter and slide on such bore, the same being productive of advantage in construction and operation ofthe parts as well as greatly cheapenin g their manufacture.

Vhat, therefore, I claim as of my present invention may be stated as follows:

1. The cutter-head as made with the cylindrical bore, and with the bearing portion d beveled as described with respect to the axis ofthe head, in combination with the chisel as formed cylindrical to lit the bore and with the two bevels at and back of its cutting-edge, all substantially as represented and described.

2. The adjusting-screw C, as provided with the head 7c and neck l, in combination with the chisel as made with the head and neck recess fm, constructed to open out of one side of such chisel, in manner-and for the purpose as sp eciied.

Witnesses: JAMES R. BROWN.

It. H. EDDY, J. It. SNOW. 

